Malicious PDF — malware analysis report

Static analysis result for SHA-256 218ae519da2756f0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 13:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3202489621dd83d4e9e0231ecabff246 SHA-1: 1842703acebfa09748b4197c298a4a763ef88b03 SHA-256: 218ae519da2756f0c152dc0f3a2bf0e3e54aa05495b96146a4b332a835ff37d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to distribute content or phish users through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://raovat72.vn/uploads/news_file/lewis.pdf In PDF document text
    • https://allegypttours.net/userfiles/files/pabilojajuxerumar.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/tokifawotukaxuzogasoz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613100a0db3f3---25654580090.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/24142768772.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/genizivanonuwebago.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/roxulepuvixu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/64762425110.pdfIn PDF document text
    • http://compsult.net/userfiles/file/70298379995.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28747582276.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/gufaw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c35a101b6---48777359653.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/jexapubufogisu.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/wizuxewavekewobi.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vefituwolizakosas.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/32777309553.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/siwewojolikoxojozudo.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/dovufalavekiwozumuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cinema+apk+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10248 bytes
SHA-256: 387205e2dac7fb11a91d83edf14dfa2b73b8e88f4711bd7fc956a0abcf1724e7
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 18704 bytes
SHA-256: 10783813fafa0089a8eedd20e0269ac8d368b6b65ca97c107e640da9a1db213f

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